drainage area vs catchment basin

drainage area and catchment basin both are nouns.

Word	Noun	Adjective	Verb	Adverb
drainage area	Yes	No	No	No
catchment basin	Yes	No	No	No

As nouns, drainage area and catchment basin are synonyms defined as:

drainage area and catchment basin: the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet

Other synonyms of drainage area include basin, catchment area, drainage basin, river basin, watershed.

drainage area (noun)	catchment basin (noun)
the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet	the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet